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Ransom.Win64.ARCRYPT.YJEIT

October 04, 2024
 Analysis by: Raighen Sanchez
 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It does not have any propagation routine.

It does not have any backdoor routine.

It does not have any information-stealing capability.

It encrypts files with specific file extensions. It drops files as ransom note.

  TECHNICAL DETAILS

File Size:

3,217,920 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

24 Sep 2024

Payload:

Disables AV, Drops files, Encrypts files, Terminates processes

Arrival Details

This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Ransomware drops the following files:

  • {malware filepath}\log.txt → contains the status of encryption, deleted afterwards
  • %Desktop%\userfile.cdci
  • %Desktop%\userfile1.cdci

Propagation

This Ransomware does not have any propagation routine.

Backdoor Routine

This Ransomware does not have any backdoor routine.

Rootkit Capabilities

This Ransomware does not have rootkit capabilities.

Process Termination

This Ransomware terminates the following services if found on the affected system:

  • vss
  • wbengine
  • MongoDB
  • SQLWriter
  • MSSQLServerOLAPService
  • MSSQLSERVER
  • MSSQLFDLauncher
  • MSSQLSQLEXPRESS
  • MSSQL$ERASQL
  • SQLSERVERAGENT
  • ReportServer
  • OracleServiceORCL
  • OracleRemExecService
  • OracleVssWriterORAFPC
  • OracleServiceORAFPC
  • Oracle Object Service
  • OracleASMService+ASM2
  • OracleMTSRecoveryService
  • OracleOHService
  • OracleOraCrs11g_home1TNSListener
  • OracleOraCrs11g_home1TNSListenerLISTENER_SCAN1
  • OracleJobSchedulerORAFPC
  • OracleServiceSYS12
  • OracleServiceZAC12
  • postgresql-x64-13
  • AssetViewCore
  • AssetViewDBService
  • AssetViewFileTransferService
  • SQLBrowser
  • OracleDBConsoleorcl
  • OracleVssWriterORCL
  • MySQL
  • ASLogWatch
  • CAARCUpdateSvc
  • CASAD2DWebSvc
  • CASDiscovery
  • CASUniversalAgent
  • HpePqiESrv
  • Standby Express zac1
  • Standby Express zac1 Agent

It terminates the following processes if found running in the affected system's memory:

  • sql.exe
  • dbsnmp.exe
  • isqlplussvc.exe
  • xfssvccon.exe
  • mydesktopservice.exe
  • ocautoupds.exe
  • encsvc.exe
  • tbirdconfig.exe
  • mydesktopqos.exe
  • ocomm.exe
  • dbeng50.exe
  • sqbcoreservice.exe
  • excel.exe
  • infopath.exe
  • msaccess.exe
  • mspub.exe
  • onenote.exe
  • outlook.exe
  • powerpnt.exe
  • thebat.exe
  • thunderbird.exe
  • visio.exe
  • winword.exe
  • wordpad.exe
  • sqlwriter.exe
  • oracle.exe
  • ocssd.exe
  • mysqld.exe
  • mysqld-nt.exe
  • mysqld-opt.exe
  • sqlbrowser.exe
  • sqlagent.exe
  • msftesql.exe
  • sqlservr.exe
  • notepad.exe

Information Theft

This Ransomware does not have any information-stealing capability.

Other Details

This Ransomware does the following:

  • It requires to be executed with the password/passphrase in order to proceed with its malicious routine:
    • 3456qwer
  • It requires to be executed as an administrator.
  • It clears the event logs of the affected system.
  • It encrypts local, removable, and network drives.
  • It encrypts the recycle bin of the affected system.

It does not exploit any vulnerability.

Ransomware Routine

This Ransomware encrypts files with the following extensions:

  • .xlsx
  • .xlsm
  • .odt
  • .ost
  • .ppt
  • .pptm
  • .ppsm
  • .pptx
  • .sldm
  • .csv
  • .dwg
  • .dxf
  • .dws
  • .fcs
  • .analysis
  • .comp
  • .compensation
  • .vmdk
  • .pst
  • .msg
  • .pdf
  • .eml
  • .wab
  • .mdf
  • .ldf
  • .myd
  • .dbf
  • .pgsql
  • .sql
  • .sqlite
  • .db
  • .sqlite3
  • .db2
  • .cql
  • .rdb
  • .ova
  • .vmdk
  • .vmsd
  • .vmx
  • .vswp
  • .WALLET
  • .CLASS
  • .INCPAS
  • .ACCDR
  • .ACCDT
  • .ACCDE
  • .D3DBSP
  • .BACKUPDB
  • .BACKUP
  • .IBANK
  • .PKPASS
  • .MDDATA
  • .MDBACKUP
  • .vmem
  • .hvd
  • .vhdx
  • .gdb
  • .cbk
  • .SYNCDB
  • .LAYOUT
  • .DAZIP
  • .ARCH00
  • .VPP_PC
  • .MCMETA
  • .MPQGE
  • .LITEMOD
  • .ASSET
  • .FORGE
  • .RGSS3A
  • .WOTREPLAY
  • .MRWREF
  • .dmp
  • .dump
  • .rtf
  • .nst
  • .trx
  • .cs
  • .rpt
  • .BLEND
  • .DESIGN
  • .YCBCRA
  • .SQLITEDB
  • .SAS7BDAT
  • .PSAFE3
  • .ERBSQL
  • .DB-JOURNAL
  • .MONEYWELL
  • .vib
  • .vbk
  • .vbm
  • .bak
  • .trn
  • .rdl
  • .edb
  • .config
  • .ev
  • .evtmp
  • .ldb
  • .mod
  • .mkv
  • .dat
  • .ai
  • .cab
  • .mdbx
  • .bkf
  • .arc
  • .srv
  • .bkp

It avoids encrypting files found in the following folders:

  • Program Files
  • Program Files (x86)
  • Windows
  • AppData

It renames encrypted files using the following names:

  • {19 random numbers}.SCBIN

It drops the following file(s) as ransom note:

  • %Desktop%\readme.txt

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

19.602.04

FIRST VSAPI PATTERN DATE:

20 Sep 2024

VSAPI OPR PATTERN File:

19.603.00

VSAPI OPR PATTERN Date:

21 Sep 2024

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  •  {malware filepath}\log.txt
  • %Desktop%\userfile.cdci
  • %Desktop%\userfile1.cdci
  • %Desktop%\readme.txt

Step 4

Scan your computer with your Trend Micro product to delete files detected as Ransom.Win64.ARCRYPT.YJEIT. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check the following Trend Micro Support pages for more information:

Step 5

Restore encrypted files from backup.


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